REQUIREMENT OF PROTEIN AND ENERGY FOR BROILERS DURING SUMMER SEASON
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Date
1992-09-04
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES Mannuthy - Trichur
Abstract
An experiment was designed and conducted to establish
the requirements of protein and energy for broilers during
the summer season in the hot and humid atmosphere of Kerala.
Four trials were conducted in a span of two years. In each
trial the following energy-protein combinations at starter,
and subsequent finisher diets were tested in a completely
randomised design.
Treatment Starter Finisher
Diet 1 22% CP:2900 Real ME/kg 19% CP:3000 Real ME/kg
Diet 2 24% CP:2900 Real ME/kg 19% CP:2900 Real ME/kg
Diet 3 26% CP:2900 Real ME/kg 19% CP:3000 Real ME/kg
Diet 4 26% CP;2900 Real ME/kg 19% CP:2900 Real ME/kg
Trials corresponding to the same period for the two
years were pooled and the results were presented as Period A
(started in early summer and ended in peak summer) and
Period B (started in peak summer and ended in late summer).
Except for the difference in nutrient intake, all the
management practices followed were uniform for the different
trials and treatment groups. Feed and water were given ad
lib- The chicks were fed with starter diet upto six weeks
of age and finisher diet upto eighth week of age.
Results of the study revealed that body weight at
eighth week of age was not influenced by different energy
protein levels in the diet during both Period A and
Period B. But difference between periods was statistically
(P < 0.01) significant. Broiler chicks reared during Period
A showed significantly lower mean body weight at eight week
than Period B. Dietary combination of 22:2900 in the
starter and 19:3000 in the finisher stage upto eight weeks
of age was found to be optimum for growth of broilers in
summer months in Kerala.
Body weight gain was not influenced by the dietary
treatments and by periods upto sixth week of age. Thereafter
body weight gain was influenced by season. Broiler chicks
reared during Period B showed higher body weight gain than
Period A. Maximum body weight gain was recorded at fifth
week of age in both Period A and Period B.
Feed consumption was not affected by dietary treatments
in both Period A and Period B, but was significantly
affected by periods at seventh and eighth week of age. Feed
efficiency was also not affected by different dietary
treatments upto eight weeks of age. Broiler chicks reared
during Period A showed poorer feed efficiency from sixth
week onwards.
Processing yields and lossesf per cent abdominal fat
and per cent body fat were not affected by dietary
treatments or periods. Bio-chemical parameters like
haemoglobin value and plasma protein value (g per cent) were
not affected by different dietary treatments or periods.
Per cent liver fat estimated as ether extract was
significantly lower (P < 0.01) during Period B than
Period A. Fat constants such as Iodine Value and
Saponification Value were not affected by different energy
protein levels of the diet. Mortality was not affected by
different dietary treatments or periods.
From the overall results of the study it is concluded
that commercial broilers grown in the climatic condition of
Kerala, require 22 per cent crude protein and 2900 Kcal
ME/kg in the starter diet coupled with 19 per cent crude
protein and 3000 Kcal ME/kg in the finisher diets.
Manipulation of dietary protein and/or energy have little
effect in alleviating poor growth rate in broilers observed
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